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Hypothalamic prepro-orexin mRNA level is inversely correlated to the non-rapid eye movement sleep level in high-fat diet-induced obese mice

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Title: Hypothalamic prepro-orexin mRNA level is inversely correlated to the non-rapid eye movement sleep level in high-fat diet-induced obese mice
Authors: Tanno, Shogo Browse this author
Terao, Akira Browse this author →KAKEN DB
Okamatsu-Ogura, Yuko Browse this author →KAKEN DB
Kimura, Kazuhiro Browse this author →KAKEN DB
Keywords: Obesity
High-fat diet
Orexin
Non-rapid eye movement sleep
Issue Date: Jul-2013
Publisher: Elsevier
Journal Title: Obesity Research & Clinical Practice
Volume: 7
Issue: 4
Start Page: E251
End Page: E257
Publisher DOI: 10.1016/j.orcp.2013.01.005
PMID: 24306152
Abstract: Orexins are hypothalamic neuropeptides, which play important roles in the regulation and maintenance of sleep/wakefulness states and energy homeostasis. To evaluate whether alterations in orexin system is associated with the sleep/wakefulness abnormalities observed in obesity, we examined the mRNA expression of prepro-orexin, orexin receptor type 1 (orexin 1r), and orexin receptor type 2 (oxexin 2r) in the hypothalamus in mice fed with a normal diet (ND) and high-fat diet (HFD)-induced obese mice. We also compared their relationships with sleep/wakefulness. Twenty-four, 4-week-old, male C57BL/6J mice were divided randomly into three groups, which received the following: (1) ND for 17 weeks; (2) HFD for 17 weeks; and (3) ND for 7 weeks and HFD for a further 10 weeks. The body weights of mice fed the HFD for 10-17 weeks were 112-150% of the average body weight of the ND group. The daily amount of non-rapid eye movement (NREM) sleep increased significantly in HFD-fed mice. These changes were accompanied by increases in the number but decreases in the duration of each NREM sleep episode. In addition, brief awakenings (<20 s epoch) during NREM sleep was nearly 2-fold more frequent. The mRNA level of prepro-orexin in the hypothalamus was significantly reduced in HFD-induced obese mice, whereas the levels of orexin 1r and orexin 2r were unaffected. The daily amount of NREM sleep was negatively correlated with the hypothalamic prepro-orexin mRNA level, so these results suggest that the increased NREM sleep levels in HFD-induced obese mice are attributable to impaired orexin activity. (C) 2013 Asian Oceanian Association for the Study of Obesity. Published by Elsevier Ltd. All rights reserved.
Type: article (author version)
URI: http://hdl.handle.net/2115/54815
Appears in Collections:獣医学院・獣医学研究院 (Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 寺尾 晶

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